Published in Proceedings of the California Academy of Sciences, in 1934, in volume 21, pages 147-172
Published in Proceedings of the California Academy of Sciences, in 1934, in volume 21, pages 173-181
Published in Proceedings of the California Academy of Sciences, in 1934, in volume 21, pages 189-198
Published in Proceedings of the California Academy of Sciences, in 1934, in volume 21, pages 199-210
Published in Proceedings of the California Academy of Sciences, in 1934, in volume 21, pages 211-224
Published in Proceedings of the California Academy of Sciences, in 1934, in volume 21, issue 15, pages 183-188